Hi Steve
We visited a few times in the late 1980's. My wife's family lives in Bogota, Colombia so we used to make the "Gran Tour": Atlanta - Bogota - Quito - Bogota - Atlanta. Now that retirement is here and since the air fares are ridiculous, we haven't visited for a while.
My sister-in-law lives in Quito, Ecuador at the foot of Guagua Pinchincha. This volcano burped in 1999 and my sister-in-law had over an inch of ash in her house.
https://www.google.com/search?q=gua...EdAs8Q7AkIXgWe went to Cotopaxi snow cap in a Ford Bronco which was a little scary as the tires were almost off the dirt road. For those who have never been to any place in the Andes, very few roads have guard rails. Also, driving across the plain there were little spouts of steam coming from the ground. I don't remember any shelters or hikers.
Since you hike, this may interest you. In Junior High School I had joined the Hiking Club. One school vacation the club members climbed Mount Katahdin. From there, we hiked the Appalacian Trail as far as we could get in a week. We never did make New Hampshire.
Jerry B